-- CoreEdu 服务数据库初始化脚本（P3 完整版）
-- 共 14 表：考试域 3 + 作业域 3 + 成绩域 2 + 排课考勤域 4 + Outbox 1 + 教师关联 1
-- 仲裁依据：02-architecture-design.md §3.1 + president-final-rulings §2.5

-- ============================================================================
-- 考试域
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_exams (
  id CHAR(36) NOT NULL PRIMARY KEY,
  class_id CHAR(36) NOT NULL,
  subject_id CHAR(36) NOT NULL,
  title VARCHAR(200) NOT NULL,
  description TEXT,
  exam_date DATETIME NOT NULL,
  duration INT NOT NULL,
  total_score DECIMAL(6,2) NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'draft',
  status_changed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  status_changed_by CHAR(36),
  school_id CHAR(36) NOT NULL,
  created_by CHAR(36) NOT NULL,
  archived_at DATETIME NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_exams_class_status (class_id, status),
  INDEX idx_exams_school_date (school_id, exam_date),
  INDEX idx_exams_created_by (created_by)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_exam_questions (
  id CHAR(36) NOT NULL PRIMARY KEY,
  exam_id CHAR(36) NOT NULL,
  question_id CHAR(36) NOT NULL,
  `order` INT NOT NULL,
  score DECIMAL(6,2) NOT NULL,
  question_type VARCHAR(30) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_exam_questions_exam_id (exam_id),
  INDEX idx_exam_questions_question_id (question_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_exam_submissions (
  id CHAR(36) NOT NULL PRIMARY KEY,
  exam_id CHAR(36) NOT NULL,
  student_id CHAR(36) NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'not_submitted',
  submitted_at DATETIME NULL,
  graded_at DATETIME NULL,
  graded_by CHAR(36),
  total_score DECIMAL(6,2) NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_exam_student (exam_id, student_id),
  INDEX idx_exam_submissions_exam_id (exam_id),
  INDEX idx_exam_submissions_student_id (student_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- 作业域
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_homework (
  id CHAR(36) NOT NULL PRIMARY KEY,
  class_id CHAR(36) NOT NULL,
  subject_id CHAR(36) NOT NULL,
  title VARCHAR(200) NOT NULL,
  description TEXT,
  due_date DATETIME NOT NULL,
  grace_period INT NOT NULL DEFAULT 300,
  status VARCHAR(20) NOT NULL DEFAULT 'assigned',
  school_id CHAR(36) NOT NULL,
  created_by CHAR(36) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_homework_class_status (class_id, status),
  INDEX idx_homework_created_by (created_by)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_homework_submissions (
  id CHAR(36) NOT NULL PRIMARY KEY,
  homework_id CHAR(36) NOT NULL,
  student_id CHAR(36) NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'not_submitted',
  submitted_at DATETIME NULL,
  graded_at DATETIME NULL,
  graded_by CHAR(36),
  total_score DECIMAL(6,2) NULL,
  feedback TEXT,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_hw_student (homework_id, student_id),
  INDEX idx_hw_submissions_homework_id (homework_id),
  INDEX idx_hw_submissions_student_id (student_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_homework_answers (
  id CHAR(36) NOT NULL PRIMARY KEY,
  submission_id CHAR(36) NOT NULL,
  question_id CHAR(36) NOT NULL,
  answer TEXT,
  score DECIMAL(6,2) NULL,
  teacher_comment TEXT,
  is_correct BOOLEAN NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_hw_answers_submission_id (submission_id),
  INDEX idx_hw_answers_question_id (question_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- 成绩域
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_grades (
  id CHAR(36) NOT NULL PRIMARY KEY,
  student_id CHAR(36) NOT NULL,
  exam_id CHAR(36),
  homework_id CHAR(36),
  score DECIMAL(6,2) NOT NULL,
  total_score DECIMAL(6,2) NOT NULL,
  feedback TEXT,
  graded_by CHAR(36) NOT NULL,
  school_id CHAR(36) NOT NULL,
  idempotency_key VARCHAR(128),
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_student_exam (student_id, exam_id),
  UNIQUE KEY uniq_student_hw (student_id, homework_id),
  UNIQUE KEY uniq_idempotency (idempotency_key),
  INDEX idx_grades_student_id (student_id),
  INDEX idx_grades_exam_id (exam_id),
  INDEX idx_grades_homework_id (homework_id),
  INDEX idx_grades_graded_by (graded_by)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_grade_formulas (
  id CHAR(36) NOT NULL PRIMARY KEY,
  scope VARCHAR(20) NOT NULL,
  scope_id CHAR(36) NOT NULL,
  formula_type VARCHAR(20) NOT NULL,
  weights JSON,
  custom_expression TEXT,
  effective_from DATETIME NOT NULL,
  effective_to DATETIME NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_grade_formulas_scope (scope, scope_id),
  INDEX idx_grade_formulas_effective (effective_from, effective_to)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- 排课考勤域
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_courses (
  id CHAR(36) NOT NULL PRIMARY KEY,
  class_id CHAR(36) NOT NULL,
  subject_id CHAR(36) NOT NULL,
  teacher_id CHAR(36) NOT NULL,
  school_id CHAR(36) NOT NULL,
  name VARCHAR(200) NOT NULL,
  start_date DATE NOT NULL,
  end_date DATE NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_courses_class_id (class_id),
  INDEX idx_courses_teacher_id (teacher_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_lessons (
  id CHAR(36) NOT NULL PRIMARY KEY,
  course_id CHAR(36) NOT NULL,
  title VARCHAR(200) NOT NULL,
  `order` INT NOT NULL,
  knowledge_point_ids JSON,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_lessons_course_id (course_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_schedules (
  id CHAR(36) NOT NULL PRIMARY KEY,
  course_id CHAR(36) NOT NULL,
  lesson_id CHAR(36),
  teacher_id CHAR(36) NOT NULL,
  class_id CHAR(36) NOT NULL,
  room_id CHAR(36),
  start_time DATETIME NOT NULL,
  end_time DATETIME NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'scheduled',
  school_id CHAR(36) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_schedules_teacher_time (teacher_id, start_time, end_time),
  INDEX idx_schedules_class_time (class_id, start_time, end_time),
  INDEX idx_schedules_course_id (course_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS core_edu_attendance (
  id CHAR(36) NOT NULL PRIMARY KEY,
  schedule_id CHAR(36) NOT NULL,
  student_id CHAR(36) NOT NULL,
  status VARCHAR(20) NOT NULL,
  remark TEXT,
  recorded_by CHAR(36) NOT NULL,
  school_id CHAR(36) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_sched_student (schedule_id, student_id),
  INDEX idx_attendance_student_id (student_id),
  INDEX idx_attendance_schedule_id (schedule_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- Outbox（事务性发件箱）
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_outbox (
  id CHAR(36) NOT NULL PRIMARY KEY,
  event_id CHAR(36) NOT NULL,
  aggregate_id CHAR(36) NOT NULL,
  aggregate_type VARCHAR(50) NOT NULL,
  event_type VARCHAR(100) NOT NULL,
  occurred_at DATETIME NOT NULL,
  payload TEXT NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'pending',
  retry_count BIGINT NOT NULL DEFAULT 0,
  next_retry_at DATETIME NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  processed_at TIMESTAMP NULL,
  UNIQUE KEY uniq_event_id (event_id),
  INDEX idx_outbox_status_retry (status, next_retry_at),
  INDEX idx_outbox_aggregate (aggregate_type, aggregate_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- 教师关联（IAM 事件消费幂等）
-- ============================================================================

CREATE TABLE IF NOT EXISTS core_edu_teacher_associations (
  id CHAR(36) NOT NULL PRIMARY KEY,
  teacher_id CHAR(36) NOT NULL,
  class_id CHAR(36) NOT NULL,
  subject_id CHAR(36),
  school_id CHAR(36) NOT NULL,
  source VARCHAR(20) NOT NULL DEFAULT 'iam_event',
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_teacher_class_subject (teacher_id, class_id, subject_id),
  INDEX idx_teacher_assoc_teacher_id (teacher_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- 班级表（从 classes 服务合并，保留原表名兼容 CDC）
-- ============================================================================

CREATE TABLE IF NOT EXISTS classes (
  id CHAR(36) NOT NULL PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  grade_id CHAR(36) NOT NULL,
  head_teacher_id CHAR(36),
  description TEXT,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_classes_grade_id (grade_id),
  INDEX idx_classes_head_teacher (head_teacher_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ============================================================================
-- P3.13 新增表：考试草稿、考试违规、请假申请
-- ============================================================================

-- 考试草稿表（学生考试过程中的自动保存）
CREATE TABLE IF NOT EXISTS core_edu_exam_drafts (
  id CHAR(36) NOT NULL PRIMARY KEY,
  exam_id CHAR(36) NOT NULL,
  student_id CHAR(36) NOT NULL,
  answers JSON,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uniq_exam_student_draft (exam_id, student_id),
  INDEX idx_exam_drafts_student (student_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 考试违规表（防作弊事件记录）
CREATE TABLE IF NOT EXISTS core_edu_exam_violations (
  id CHAR(36) NOT NULL PRIMARY KEY,
  exam_id CHAR(36) NOT NULL,
  student_id CHAR(36) NOT NULL,
  violation_type VARCHAR(40) NOT NULL,
  detail TEXT,
  severity INT NOT NULL DEFAULT 1,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_exam_violations_exam (exam_id),
  INDEX idx_exam_violations_student (student_id),
  INDEX idx_exam_violations_type (violation_type)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 请假申请表
CREATE TABLE IF NOT EXISTS core_edu_leave_requests (
  id CHAR(36) NOT NULL PRIMARY KEY,
  student_id CHAR(36) NOT NULL,
  class_id CHAR(36) NOT NULL,
  leave_type VARCHAR(20) NOT NULL,
  start_date DATE NOT NULL,
  end_date DATE NOT NULL,
  reason TEXT NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'pending',
  submitted_by CHAR(36) NOT NULL,
  reviewed_by CHAR(36),
  review_comment TEXT,
  school_id CHAR(36) NOT NULL,
  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_leave_requests_student (student_id),
  INDEX idx_leave_requests_class (class_id),
  INDEX idx_leave_requests_status (status),
  INDEX idx_leave_requests_school (school_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;